new patch

Hi,

you will find attached a new X50 patch.
It is mainly a modified version of the device-independent
ADS7846/TSC2046 driver released by Paul a few days ago :
- Kconfig takes into account all X50 variants (not really required for
now, but allow to manage cleanly the axim family),
- aximx50.c. includes the touchscreen driver information, and some
unuseful udc code has been removed,
- ads7846ts_ssp.c : read_xydata is now less value-dependent, and a
mechanism derived from the tsc2046 driver to detect pen release (based
on gpio) has been added. ADS/TSC commands are now on 24 bits,
- ads7846_adc_ssp.c : re-use initialization from tsc2046 driver,

As I can not build familiar, I did not test it with tslib tools, but it
should work. If someone could confirm...

Paul : I don't think this patch should be integrated as is, but it may
help you to adapt your driver.

Comments and remarks are welcome,

Pierre